Chain-stitch sewing-machine.



No. 707,22 7. Patented Aug. l9, I902.

u. .lfnAucnck, CHAIN STITCH SEWING MACHINE.

V (pplicatiqn filed Dan}, 1901.) woman.) 2 Sheets-Sheet THE Nonms virusso. maToumou WASNINGYOPL n. C

No. 707,227. Patented/Aug. I9, |9D'2.'

( H. J. HANCOCK; CHAIN STITCH SEWING MACHINE.

(Application filed Dec. 4, 1901.)

(No Model.) 2 Sheeis--Sheet 2.

WITNESSES: INVENTOR i so UNITED STATES PATENT OFFICE.

HENRY J. HANCOCK, OF NEW YORK, N. Y., ASSIGNOR OF ONE-I-IALF'TO WILLIAMS. JESSUP, OF NEW YORK, N. Y.

CHAIN-STITCH SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 707,227, dated August19, 1902. Application filed December 4.1901. Serial Ne. 84,606.(Ne-meson To all whom it may concern.-

Be it known that I, HENRY J. HANCOCK, a

citizen of the United States, residing at New Figure 1 is a sideelevation of my improved Fig. 2 is a front view there-' sewing-machine.

of, the table being in section. Fig. 3 is a View of the two needle-barsin a difierent po sition from that shown in Fig. 2. Fig. 4 is a viewofthe cam-lever in position and a portion of one of the needle-bars. Fig.5 is an enlarged View of the presser-foot and head carrying the same.Fig. 6 is a view of the central portion of the presser-foot," and Fig. 7is a plan view of the spool-holder.

In the accompanying drawings like numerals of reference refer to thesame parts in each ofv the views, and in the practice of my invention Iprovide a frame 8, carrying shaft 9, on one end of which I mount a wheel10, having a handle 11. On the opposite end of the shaft 9 I form acrank-arm 12, on which I mount a cross-bar 13 and one needle-bar 14. Onthe free end of the bar 13 I mount a second needle-bar 15, which isprovided at the lower end with an eye 16, through which the thread17'passes, and the needle-bar carries an eye-pointed needle 18, whilethe needle-bar 14 carries a blank needle 19. I also prefer to mount atension 20 for the thread on the needle-bar 15. r

On the frame 8 above the shaft 9 I pivotally mount a cam-lever 21,having a cam-slot 22 formed therein, and on the crank 12 I form ashoulder 23, adapted-'"to engage the sides 24 and 25 of said cam-slot 22and swing the lower end 26 of said cam-lever back and forth, as will bereadily understood. In the end 26 of said cam-lever I mount a pin orstud 27, and in the needle-bar 14 I form a lonforth by the movement ofthe cam-lever 21.

The frame 8 is provided with a cross-head 29, in which a presser-foot30, formed out of a wire rod, is mounted and held in an adjustablemanner by set-screws 31. Both ends I of the rod forming the'presser-footare mounted in the said head, sothat' the central portion of the rodforms the part of the presserfoot which comes in contact with the cloth.This part is bent outward, as clearly shown in Fig. 1, and in thecentral part thereof is formed a slot of peculiar shape, as clearlyshownin Fig. 6, one end being substantially V-shaped in form,-as shownat 31, the other end having a backwardly-inclined wall 32, and the endis V-shapedin form, as shown at 33, but back or at one side of the end31,

;so that when the needles 18 and 19 are at the opposite ends of the slot34 the needle 19 will be back of the needle 18 and will "descend at theneedles play, and on-the outer end 38 is mounted the'cloth plateor table39, and the lever 36 is controlled by a'carn-lever 40, having serrationsor teeth'41 on" its upper edge, which engage the lower surface of thelever 36 and hold the same at any point in a secure manner, so that thecloth-plate can be raised or lowered, as indicated by dotted lines inFig. 1, and after the clothis inserted beneath the presser-foot 30 thecloth-plate is brought up to the presser-foot instead of the presserfootbeing lowered on the cloth. I also provide a spool-holder 42, which maybe provided with a nut 43 and washers 44, so that tension may be placedon the spool 45, as'wil lb e understood, and I also prefer to have athreadguide 46. f

The operation is asfollows: The cloth is inserted between theresser-foot and the clothplate. The plate is then raised until the clothwill be held rather firm, but not tight enough to prevent the readyfeeding of the cloth. The shaft 9 is rotated by the handle 11, and thecrank 12 carries around with it the cross-bar 13, which is fixed thereonin a predetermined position, and also carries with it the needlebar 14,which is pivotally mounted on said crank. The other needle bar ispivotally mounted on the free end of the cross-bar 13. As the crank 12is rotated the shoulder 23 engages alternately the walls 24 and 25 andcarries the needle 19 back and forth in the slot 34 of the presser-footat the same time the needle-bar is ascending and descending. The partsare so timed that the needle 19 will be in the end 33 of the slot whenthe needle is descending, at which time it will be at one side of theneedle 18, which carries the thread, and as the needle 19 descends theneedle 18 is timed so that it will commence its ascent and throw out aloop 47, through which the needle 19 passes in its descent. When theneedle 19 is at the lowest point, it will be car ried toward the otherneedle by reason of the shoulder 23 engaging the side 25 of the camuntil both needles are at the end 31 of the slot, as clearly shown inFig. 3, at which time the needles are substantially in the same line,and the needle 18 is held in. the end 31 during its descent, so that itmust pass directly through the loop of the thread held on the needle 19,and the needle 19 is so timed that it will leave the loop shortly afterthe needle 18 enters it and is ready to descend again and catch the nextloop as it is thrown out. At the time the needle 19 is brought forwardto hold the needle 18 in the end of the slot 34 it will feed the clothalong the length of the stitch, as will be readily understood. Theinclined end 32 of the slot 34 serves tojcarry the needle 19 back, sothat it will pass on one side of the needle 18 in the descent and passthrough the loop of the thread instead of striking against the needle18; but when the needle 19 passes out from this end of the slot itimmediately springs back into a line parallel with the needle 18, thisbeing efiected by the looseness and spring of the parts; but the partsare held quite rigid by the V-shaped end 31 of the slot 34 and thecam-lever 21 when the needle 18 is descending, so that the needle 18cannot fail to pass through the loop held on the needle 19, this partnot being illustrated because it will be readily understood by any oneskilled in the art.

It will be understood that many changes in the details of constructioncan be made without departing from the spirit of my invention, and Ireserve the right to make all such changes.

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is

1. A chain-stitch sewing-machine comprising a frame, a crank-shaftprovided at one end with a crank, means to rotate said shaft, twoneedle-bars carrying needles mounted on said crank, a cam-leverpositively operated by said crank and controlling one of saidneedle-bars, a cloth-plate, and a presser-foot provided with a slotadapted to carry one needle back, or at one side of the other in itsdescent, and to hold the needles parallel during the descent of theother needle, for the purpose set forth.

2. A chain-stitch sewing-machine comprising a frame, a crank-shaftprovided at one end with a crank, means to rotate said shaft, twoneedle-bars carrying needles mounted on said crank, a cam-leverpivotally connected with the frame above said shaft and provided with aslot, said crank being provided with a projection in engagement with thewalls of said slot in the cam-lever, said cam-lever being in engagementwith one of said needlebars, a cloth-plate, and a presser provided witha slot adapted to carry one needle back, or at one side of the other inits descent, and to hold the needles parallel during the descent of theother needle, as and for the purpose set forth.

3. A chain-stitch sewing-machine comprising a frame, a crank-shaftprovided with a crank and means to rotate said shaft, a crossbar fixedon said crank, a needle-bar pivotally mounted on said crank, a secondneedlebar pivotally mounted on the free end of said cross-bar andcarrying an eye-pointed needle, a presser-foot provided with a slotadapted to carry the respective needle back of the eyepointed needleduring its descent and to hold the needles parallel during the descentof the eye-pointed needle, a cam-lever mounted on the frame and providedwith a cam-slot and a stud engaging a slot in one of said needlebars,and a shoulder on said crank adapted to engage said cam-lever topositively control said needle-bars, as and for the purpose set forth.

4. A chain-stitch sewing-machine comprising a frame, a crank-shaftprovided with a crank having a shoulder, two needle -bars mounted onsaid crank, a cam-lever adapted to positively control said needle-bars,a presserfoot provided with a slot adapted to control the movement ofthe needles during a portion of their movement, a lever pivoted on theframe, a cloth-plate mounted thereon, and a cam-lever provided withserrations or teeth adapted to engage said last-named lever, as and forthe purpose set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HENRY J. HANCOCK.

Witnesses:

E. L. LIVINGSTONE, JrRAHAM MOA'DAM.

IIO

